Add API caching, move calls out into its own modules for reuse.

evesde/models/cache.py

@@ -0,0 +1,14 @@
+from django.db import models
+
+
+class EVEAPICache(models.Model):
+
+    key = models.CharField('Cache Key', blank=False, max_length=40)
+    cache_until = models.DateTimeField('Cached Until', blank=False)
+    document = models.TextField('Document')
+
+    class Meta:
+            app_label = 'evesde'
+
+    def __unicode__(self):
+        return '%(key)s - %(cache_until)s' % self.__dict__